| Global Penfriends | | List your information for free for others to contact you, or join Global Penfriends to select your own penpals. |
| International Pen Friends | | Established in April 1967, membership has grown to over 1.5 million worldwide. Individual and school applications are available. |
| Just Write - Where Letter Writers Meet | | A quarterly magazine where people place listings to meet other letter writers. Paid subscription includes 50 words in each publication and a forwarding service. |
| Letters 4 Friends | | Pen pals listed by country or date of addition. Available also in German and French. |
| Pen Pallers Zone | | A site with both email and postal penpals, swappers, and slam books. |
| PostcardX | | Postcard exchange site that encourages sending kindness to random members. |
| SAPE | | Matches people with penpals in the former USSR and Baltic countries. Applications by snail mail only |
| The Mailbox | | Adult only penpal listings for friends in a guestbook format by age group. Penpals must be contacted by email to request their postal address. |
| WCF's International PenFriends | | A non-profit cultural and educational organization based in the USA that has grown to over one million members in over 251 countries and territories around the globe. |
|
| | | |
